690 



INDEX 



Hexagonal hemipyramid, 2d order, 

 hemipyramid, 3d order, 100. 

 holoaxial, 95. 

 holosymmetric, 85. 

 polar, 99. 



prism, 1st order, 88. 

 2d order, 88. 

 3d order, 94. 

 pyramid 1st order, 86. 

 2d order, 87. 

 3d order, 94- 

 system, 17, 84. 

 trapezohedron, 96 

 Hexahedron, 51. 

 Hexagonite, 433. 

 Hexoctahedron, 48 

 Hextetrahedron, 55. 

 Hiddenite, 427. 

 Hielmite, 635. 

 Hiortdahlite, 675. 

 Hisingerite, 659. 

 Hoernesite, 653. 

 Holoaxial, 61. 

 digonal, 118. 

 hexagonal, 95. 

 tesseral, 61. 

 tetragonal, 75. 

 trigonal, 108. 

 Holohedral, 24. 

 Holosymmetric, 24- 

 cubic, 47. 

 hexagonal, 85. 

 monoclinic, 121. 

 orthorhombic, 113. 

 tetragonal, 65. 

 tri clinic, 130. 

 Homilite, 664. 

 Hope diamond, 282. 

 Hopeite, 650. 



Horizontal dispersion, 208. 

 Hornblende, 433, 676. 

 Horn silver, 330. 

 Horseflesh ore, 310. 

 Hortonolite, 658. 

 Howlite, 664. 

 Hiibnerite, 642, 665. 

 Humite, 471, 679. 

 Hyacinth, 458. 

 Hyalite, 370. 

 Hyalotekite, 648. 

 Hydrargillite, 365. 

 Hydroboracite, 664. 

 Hydrocerussite, 647. 

 Hydrochloric acid, 560. 

 Hydrocyanite, 641. 

 Hydrofluoric acid, 233. 

 Hydrogen sulphide, 232. 

 Hydrogiobertite, 661. 

 Hydroherderite, 655. 

 Hydromagnesite, 362, 661. 

 Hydronephelite, 479, 673. 



Jydrophilite, 639. 

 iydrotalcite, 663. 

 tydroxides, 362. 

 lydrozincite, 649. 

 Hypersthene, 421, 604, 616, 682. 



cc, 337. 



celand spar, 384. 



cositetrahedron, 61. 



docrase, 456. 



hleite, 636. 



lesite, 636. 



Imenite, 346, 609, 633. 



Ivaite, 472, 633, 658. 



nclined dispersion, 208. 



nclusions, 9. 



ndex of refraction, 165, 217. 



determination of, 209. 

 ndicatrix, 185, 197. 

 ndices, 18. 



determination of, 156. 



law of rational, 20. 



of refraction, 165, 209. 

 indicolite, 475. 

 indium, tests, 577. 

 inesite, 666. 

 Intercepts, 18. 

 Interference, 181. 



colors, 183. 

 Interference figure, biaxial, 200. 



uniaxial, 191. 



[ntergrowths of minerals, 243. 

 Interpenetration twins, 1^1. 

 Intumescence, 555. 

 Iodine, 589. 

 lodobromite, 645. 

 lodyrite, 330, 646. 

 lolite, 440, 613, 680. 

 Iridescence, 183, 274. 

 Iridium, 632. 

 Iridium, tests, 582. 

 Iridosmine, 632. 

 Iron, 631. 

 Iron cap, 253. 

 Iron, tests for, 575. 

 native, 283. 

 specular, 344. 

 titaniferous, 346. 

 Irregularity of crystals, 29. 

 Isoclasite, 656. 

 Isometric system, 16, 47- 

 Isomorphism, 228. 

 Isomorphous groups, 229. 

 Isomorphous mixture, 229. 

 Isotropic crystals, 163. 

 Itacolumite, 282. 



Jacobsite, 371, 633. 

 Jacynth, 458. 



